New tool: Urquhart catalogs (right now: just ATLASGAL)

James Urquhart has built the Red MSX Source and ATLASGAL catalogs:
http://rms.leeds.ac.uk/cgi-bin/public/RMS_DATABASE.cgi
atlasgal.mpifr-bonn.mpg.de/cgi-bin/ATLASGAL_DATABASE.cgi

This provides an interface to the latter that can be readily adapted to the former.  No tests yet: WIP!